Rengoku was cooking when he accidentally set the house on fire.

Mitsuri and Zenitsu: Running around, panicking.

Tanjiro, Rengoku and Gyomei: Trying to get everyone out.

Nezuko and Giyuu: Just goes back to sleep.

Inosuke: Spitting on the fire, not having a clue on what it is.

Tengen, Shinobu, Kanao and Aoi: Calling the fire department.

Sanemi, Obanai, Muichiro and Genya: The ones who make the fire worse.

You: Immune to the fire.